To reduce the iron content of kaolin to the desired levels, a variety of industrial physical and chemical processes are employed in practice. Though the physical methods (classical magnetic separation, new and more expensive super conductive magnetic separation in particular) are extensively used, generally low efficiency of these methods has led to the search for alternative chemical methods for the removal of iron, which have gained importance recently. In this study, the chemical removal of the iron impurity present in kaolin supplied by ÇİMSA Inc. was investigated by using organic acids. The effect of parameters including the type of organic acids, temperature, pulp density, leaching time and reagent concentration on the extent of iron removal were investigated applying factorial design ANOVA-Yates test technique for the statistical analysis of the results. Under optimum condition (10% pulp ratio, 40 g/L of oxalic acid concentration, 90°C temperature and 120 minutes of leaching (reaction) time), the removal of Fe2O3 was obtained as 34.45% for oxalic acid leaching.